Borrowings - Schedule of Borrowings 1 (Details)	Jun. 30, 2017
4.5% Senior Notes, due December 2020
Debt Instrument [Line Items]
Stated interest rate	4.50%
4.2% Senior Notes, due December 2021
Debt Instrument [Line Items]
Stated interest rate	4.20%
3.2% Senior Notes, due June 2023
Debt Instrument [Line Items]
Stated interest rate	3.20%
3.37% Senior Notes, due June 2025
Debt Instrument [Line Items]
Stated interest rate	3.37%